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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f3b7ed0ac969e9644fdfef400d186cde32893e93a57767b398cb95cc1498f6' 
  AND token = '4Or3gO+knGwYGmErhyOnNdA/R/slHJeE5RtPbltMJjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}